Room Temperature Synthesis of Lead-Free Stable FASnI3 Perovskite Nanoparticles
Room Temperature Synthesis of Lead-Free Stable FASnI3 Perovskite Nanoparticles
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DOI：
10.1109/pvsc43889.2021.9518462
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发表时间：
2021-06
期刊：
影响因子：
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通讯作者：
Zeying Chen;T. Dhakal
中科院分区：
文献类型：
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作者：
Zeying Chen;T. Dhakal
我们报道了一种室温合成的FASnI3纳米晶体，由于这种化合物的热力学稳定性，它具有抗Sn2+氧化到Sn4+的长期稳定性。上清液中的沉淀和颗粒均有x射线衍射峰。两个多月来多次的XRD谱图显示，sn基钙钛矿完全没有降解，这是非常显著的。我们将这种稳定性归因于fa基sn -钙钛矿的热稳定性以及用于屏蔽核心纳米晶体的配体。发光强度在830 nm附近最大，对应能量为1.49 eV，略高于该化合物体形的带隙。根据透射电子显微镜（TEM）成像获得的图像，这可能是由于纳米晶体的粒径在10纳米左右。
We report a room temperature synthesis of FASnI3 nanocrystals which exhibited long term stability against oxidization from Sn2+ to Sn4+ because of the thermodynamic stability of this compound. X-ray diffraction peaks were obtained from both precipitates and particles in the supernatant. The XRD spectra taken several times over two months so far show no degradation at all, which is very significant for the Sn-based perovskites. We attribute such a stability to the thermal stability of FA-based Sn-perovskite and to the ligands used that shield the core nanocrystals. The PL measurement showed the PL maximum around 830 nm, which corresponds to an energy of 1.49 eV, which is slightly higher than the band gap of the bulk form of this compound. This could be due to the particle size of the nanocrystals which were around 10 nm according to the images obtained by transmission electron microscopy (TEM) imaging.